New attribute created for PredictionModel subclass doesn't show up
Hi,
I am currently stuck with a quite simple problem. I have created a subclass of PredictionModel and modified the method createPredictionAttributes() as follows:
I would be glad about any help with this.
Best regards
Matthias
I am currently stuck with a quite simple problem. I have created a subclass of PredictionModel and modified the method createPredictionAttributes() as follows:
protected Attribute createPredictionAttributes(ExampleSet exampleSet, Attribute label) {
// create and add prediction attribute
/* make the label attribute independent from an existing label in the example set (since this had to be generated as dummy when classifying documents)
* original code:
* Attribute predictedLabel = AttributeFactory.createAttribute(label, Attributes.PREDICTION_NAME);
* predictedLabel.clearTransformations();
*/
Attribute predictedLabel = AttributeFactory.createAttribute(Attributes.PREDICTION_NAME, Ontology.NOMINAL);
ExampleTable table = exampleSet.getExampleTable();
Attributes attributes = exampleSet.getAttributes();
table.addAttribute(predictedLabel);
attributes.setPredictedLabel(predictedLabel);
// check whether confidence labels should be constructed
if (supportsConfidences(predictedLabel)) {
Iterator<String> labelIterator = model.classIndex.iterator();
while (labelIterator.hasNext()) {
String labelValue = labelIterator.next();
Attribute confidence = AttributeFactory.createAttribute(Attributes.CONFIDENCE_NAME + "(" + labelValue + ")", Ontology.REAL);
table.addAttribute(confidence);
attributes.setSpecialAttribute(confidence, Attributes.CONFIDENCE_NAME + "_" + labelValue);
}
// create an additional attribute for the confidence of the predicted value
Attribute predictionConfidence = AttributeFactory.createAttribute(Attributes.CONFIDENCE_NAME, Ontology.REAL);
table.addAttribute(predictionConfidence);
attributes.setSpecialAttribute(predictionConfidence, Attributes.CONFIDENCE_NAME);
}
return predictedLabel;
}
Creating the "confidence(...)" attributes works fine. After this I want to have an additional attribute "confidence" that holds the confidence of the value that was actually predicted. When printing the attribute to console I get the index of the attribute, which is the number of the existing attributes + 1. But the additional attribute doesn't show up in my example set after "Apply Model". I tried using different names or adding it as regular attribute. No chance...I would be glad about any help with this.
Best regards
Matthias
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Hi Marco,
I will let you get away with this answer because you were ill
Did you even have a look at my code? 
I have created new attributes pretty often, but in this case it simply isn't possible. I tried regular attributes as well as the shown attempt to add a special attribute. The strange thing is, that the attribute seems to be added (as printing out the attribute id indicates) but won't become visible. I guess there is some special context for the PredictionModel which is using a header example set, but I can't understand that adding lots of attributes for the confidences is working and an additional single one simply won't work...
Regards
Matthias
I will let you get away with this answer because you were ill
Did you even have a look at my code? I have created new attributes pretty often, but in this case it simply isn't possible. I tried regular attributes as well as the shown attempt to add a special attribute. The strange thing is, that the attribute seems to be added (as printing out the attribute id indicates) but won't become visible. I guess there is some special context for the PredictionModel which is using a header example set, but I can't understand that adding lots of attributes for the confidences is working and an additional single one simply won't work...
Regards
Matthias
Hi,
well yes, I did look at your code, but I may have misinterpreted the problem a bit :P
This is something I wrote a couple of weeks ago which is working just fine:
Marco
well yes, I did look at your code, but I may have misinterpreted the problem a bit :P
This is something I wrote a couple of weeks ago which is working just fine:
Regards,
exampleSet.getExampleTable().addAttribute(newAttribute);
exampleSet.getAttributes().addRegular(newAttribute);
exampleSet.getAttributes().setSpecialAttribute(newAttribute, "YourSpecialAttributeName");
Marco
Hi Marco,
this works fine for me also - at any place and for any operator I modified or created except the PredictionModel subclass. I really can't understand this, since the "confidence(<labelValue>)" attributes are created properly.
I added this for testing
I also tried to create this attribute if it's not existing from the other method performPrediction() implemented for this class, but it's the same behavior here.
It seems like I will have to add another workaround and create the attribute before the "Apply Model" operator is used. But I think you should test this in the special context given if you find the time for this.
Edit:
I just discovered another "funny" thing, when applying my workaround. I added "Generate Empty Attribute" and "Set Role" before using the "Apply Model" operator. Setting the attribute's values is done inside the performPrediction() method of the implemented model. But I only got missing values for the attribute. This was due to the code I initially posted, that should create this attribute. After commenting this out the correct values were assigned. So I must correct my opinion. Attempting to add the attribute is not only ignored it's also destroying existing attributes having the same name. :-\
Regards
Matthias
this works fine for me also - at any place and for any operator I modified or created except the PredictionModel subclass. I really can't understand this, since the "confidence(<labelValue>)" attributes are created properly.
I added this for testing
Attribute newAttribute = AttributeFactory.createAttribute("TestAttribut", Ontology.NOMINAL);
exampleSet.getExampleTable().addAttribute(newAttribute);
exampleSet.getAttributes().addRegular(newAttribute);
exampleSet.getAttributes().setSpecialAttribute(newAttribute, "YourSpecialAttributeName");
System.out.println(newAttribute);
and get #16: TestAttribut (nominal/single_value)/values=[]printed to the console. Before adding the attribute via exampleSet.getAttributes().addRegular(newAttribute); the id is -1, so adding it seems to work but it is not displayed!
I also tried to create this attribute if it's not existing from the other method performPrediction() implemented for this class, but it's the same behavior here.
It seems like I will have to add another workaround and create the attribute before the "Apply Model" operator is used. But I think you should test this in the special context given if you find the time for this.
Edit:
I just discovered another "funny" thing, when applying my workaround. I added "Generate Empty Attribute" and "Set Role" before using the "Apply Model" operator. Setting the attribute's values is done inside the performPrediction() method of the implemented model. But I only got missing values for the attribute. This was due to the code I initially posted, that should create this attribute. After commenting this out the correct values were assigned. So I must correct my opinion. Attempting to add the attribute is not only ignored it's also destroying existing attributes having the same name. :-\
Regards
Matthias
I'm sorry it took so long to answer, but it has been rather busy, and being ill didn't help anything either :-[
If you want to add attributes to an ExampleSet, you need to call these two methods: Regards,
Marco